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From: Paolo Abeni <pabeni@redhat.com>
To: mptcp@lists.linux.dev
Subject: [PATCH net-next 4/4] mptcp: optimize the input options processing.
Date: Wed, 18 Aug 2021 12:35:49 +0200	[thread overview]
Message-ID: <a9d6141b27791d0a339de98503363ab83b03106f.1629133749.git.pabeni@redhat.com> (raw)
In-Reply-To: <4209d5f5217483e4c06a43afb8e3e8322566085d.1629133749.git.pabeni@redhat.com>

Most MPTCP packets carries a single MPTCP subption: the
DSS containing the mapping for the current packet.

Check explicitly for the above, so that is such scenario we
replace most conditional statements with a single likely() one.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 net/mptcp/options.c | 70 +++++++++++++++++++++++----------------------
 1 file changed, 36 insertions(+), 34 deletions(-)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 18ad028ed589..61ef080ed46c 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1115,48 +1115,50 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
 	if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))
 		return sk->sk_state != TCP_CLOSE;
 
-	if ((mp_opt.suboptions & OPTION_MPTCP_FASTCLOSE) &&
-	    msk->local_key == mp_opt.rcvr_key) {
-		WRITE_ONCE(msk->rcv_fastclose, true);
-		mptcp_schedule_work((struct sock *)msk);
-	}
+	if (unlikely(mp_opt.suboptions != OPTION_MPTCP_DSS)) {
+		if ((mp_opt.suboptions & OPTION_MPTCP_FASTCLOSE) &&
+		    msk->local_key == mp_opt.rcvr_key) {
+			WRITE_ONCE(msk->rcv_fastclose, true);
+			mptcp_schedule_work((struct sock *)msk);
+		}
 
-	if ((mp_opt.suboptions & OPTION_MPTCP_ADD_ADDR) && add_addr_hmac_valid(msk, &mp_opt)) {
-		if (!mp_opt.echo) {
-			mptcp_pm_add_addr_received(msk, &mp_opt.addr);
-			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR);
-		} else {
-			mptcp_pm_add_addr_echoed(msk, &mp_opt.addr);
-			mptcp_pm_del_add_timer(msk, &mp_opt.addr, true);
-			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD);
+		if ((mp_opt.suboptions & OPTION_MPTCP_ADD_ADDR) && add_addr_hmac_valid(msk, &mp_opt)) {
+			if (!mp_opt.echo) {
+				mptcp_pm_add_addr_received(msk, &mp_opt.addr);
+				MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR);
+			} else {
+				mptcp_pm_add_addr_echoed(msk, &mp_opt.addr);
+				mptcp_pm_del_add_timer(msk, &mp_opt.addr, true);
+				MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD);
+			}
+
+			if (mp_opt.addr.port)
+				MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_PORTADD);
 		}
 
-		if (mp_opt.addr.port)
-			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_PORTADD);
-	}
+		if (mp_opt.suboptions & OPTION_MPTCP_RM_ADDR)
+			mptcp_pm_rm_addr_received(msk, &mp_opt.rm_list);
 
-	if (mp_opt.suboptions & OPTION_MPTCP_RM_ADDR)
-		mptcp_pm_rm_addr_received(msk, &mp_opt.rm_list);
+		if (mp_opt.suboptions & OPTION_MPTCP_PRIO) {
+			mptcp_pm_mp_prio_received(sk, mp_opt.backup);
+			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIORX);
+		}
 
-	if (mp_opt.suboptions & OPTION_MPTCP_PRIO) {
-		mptcp_pm_mp_prio_received(sk, mp_opt.backup);
-		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIORX);
-	}
+		if (mp_opt.suboptions & OPTION_MPTCP_FAIL) {
+			mptcp_pm_mp_fail_received(sk, mp_opt.fail_seq);
+			MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFAILRX);
+		}
 
-	if (mp_opt.suboptions & OPTION_MPTCP_FAIL) {
-		mptcp_pm_mp_fail_received(sk, mp_opt.fail_seq);
-		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFAILRX);
-	}
+		if (mp_opt.suboptions & OPTION_MPTCP_RST) {
+			subflow->reset_seen = 1;
+			subflow->reset_reason = mp_opt.reset_reason;
+			subflow->reset_transient = mp_opt.reset_transient;
+		}
 
-	if (mp_opt.suboptions & OPTION_MPTCP_RST) {
-		subflow->reset_seen = 1;
-		subflow->reset_reason = mp_opt.reset_reason;
-		subflow->reset_transient = mp_opt.reset_transient;
+		if (!(mp_opt.suboptions & OPTION_MPTCP_DSS))
+			return true;
 	}
 
-	if (!(mp_opt.suboptions & OPTION_MPTCP_DSS))
-		return true;
-
 	/* we can't wait for recvmsg() to update the ack_seq, otherwise
 	 * monodirectional flows will stuck
 	 */
@@ -1183,7 +1185,7 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
 
 	memset(mpext, 0, sizeof(*mpext));
 
-	if (mp_opt.use_map) {
+	if (likely(mp_opt.use_map)) {
 		if (mp_opt.mpc_map) {
 			/* this is an MP_CAPABLE carrying MPTCP data
 			 * we know this map the first chunk of data
-- 
2.26.3


      parent reply	other threads:[~2021-08-18 10:36 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 10:35 [PATCH net-next 1/4] mptcp: do not set unconditionally csum_reqd on incoming opt Paolo Abeni
2021-08-18 10:35 ` [PATCH net-next 2/4] mptcp: better binary layout for mptcp_options_received Paolo Abeni
2021-08-18 10:35 ` [PATCH net-next 3/4] mptcp: consolidate in_opt sub-options fields in a bitmask Paolo Abeni
2021-08-19  1:10   ` Mat Martineau
2021-08-18 10:35 ` Paolo Abeni [this message]

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